1. Relationship between sin and cos

2. Trig Ratios SOH-CAH-TOA

3. SINE
Pronounced “sign”

4. COSINE
Pronounced “co-sign”

5. Pronounced “tan-gent”

6. Represents an unknown angle
Greek Letter q
Pronounced “theta”
Represents an unknown angle

7. Sin-Cosine Cofunction

8. The Sin-Cosine Cofunction

9. Ex.1: What is sin A?
What is Cos C?

10. Ex. 2

11. Ex.3: Fill in the blank for the problem below.
Sin 50= cos _______

12. Guided Practice
Work on the following problems with your group members. We will review as a class in 5 minutes.

13. 1.What is Sin Z?
What is Cos X?

15. 3. Sin 28 = ?

16. 4. Cos 10 = ?

17. 5. ABC where B = 90. Cos A = 3/5 What is Sin C?

18. 6. Sin  = Cos 15 What is ?

19. 7.Draw ABC where BAC = 90 and sin B = 3/5
What is the length of AB?
What is tan C? 4
4/3

20. 8. Draw stick-man standing where the angle is and mark each given side
8. Draw stick-man standing where the angle is and mark each given side. Then tell which trig ratio you have.
sin H O